Globally dead code would not mean any problem after compilation (even I can't see where is some dead code here...), so you need not fear it...
However I can see an other problem in there...
Your version:
dtr = newDocument(fileRow);
documentList.put(getCurrentKey(fileRow), dtr);
if (dtr == null)
return true;
My version:
dtr = newDocument(fileRow);
if (dtr == null)
return true;
documentList.put(getCurrentKey(fileRow), dtr);